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Main line size

Hello all,

This summer I will be installing an irrigation system my self. I have been purchasing parts this past winter and I am now ready to buy the pipe for the main line, problem is, I'm having difficulty figuring out what diameter to use.

I have municiple water, a 1" copper service line and a 1" meter; the system holds between 47-50 psi and produces about 8 gpm. There will be 7 zones and 42 total sprinkler heads. I live in southeast Michigan so I will be using poly pipe since ground freezing is inevitable.

Any help of advice regarding diameter will be helpful. Thanks in advance.